Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P20226 (TATA-binding protein)
 1,297 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The core promoters of the rat platelet factor 4 (PF4), mouse erythropoietin and chicken beta globin genes contain a GATA motif in place of the consensus TATAAA site. In the case of the PF4 gene, this site has been shown to play a critical role in restricting transcription to the megakaryocyte lineage. In order to understand the mechanism of tissue specificity, we investigated the function of the GATA box-containing promoters in vitro. Our studies show that the TATA-binding protein of TFIID is required for initiation of transcription from the GATA box-containing promoters. GATA-1 interacts with the core promoter GATA motif and inhibits generation of preinitiation complexes. The functional significance of the inhibition of preinitiation complexes is supported by in vitro transcription assays in which transcription from the PF4 and erythropoietin core promoters is suppressed by GATA-1. We also demonstrate that GATA-2 inhibits initiation of transcription from the PF4 core promoter. Based on these results, we propose a model in which repression of PF4 expression in nonmegakaryocytes is mediated, in part, by competition between GATA-binding proteins and basal factors for the core promoter.
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PMID:The interaction of GATA-binding proteins and basal transcription factors with GATA box-containing core promoters. A model of tissue-specific gene expression. 828 42

We show here a role of the highly conserved GATA motif in the -30 region of the erythropoietin (Epo) promoter. Epo production is reduced in normoxia and activated in hypoxia to control the oxygen supply through erythropoiesis. Although the hypoxic inducibility has been analyzed, the molecular mechanism for the low basal activity in normoxia remained unclear. The GATA motif in the -30 region upstream of the transcription initiation site is highly conserved among the species. In many genes, the consensus motif in the -30 region is TATA. The GATA motif of the Epo promoter was mutated to TATA. The transcriptional activity of the mutant was enhanced even in normoxia. Binding assays showed that TATA-binding protein (TBP) could weakly bind to the wild-type GATA motif whereas TBP bound to the mutant TATA motif with high affinity. These results indicate that the highly conserved GATA motif in the -30 region of the Epo promoter can avoid binding and activation by TBP. This evidence is considered to be the molecular basis for the low physiological expression from the Epo promoter in normoxia.
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PMID:Activation of the erythropoietin promoter by a point mutation from GATA to TATA in the -30 region. 908 89